It represents a natural cave, partially inhabited by humans, with the absolute altitude of 434 m; the relative altitude of 84 m. It has five openings and has a total length of 20,500 m. The cave is huge, with a four-storied gallery network: two fossils, one subfossil and another active, resulted from the action of the water flowing from three streams. The cave was mentioned in 1880 by V. Dumitrescu; Gheorghe Murgoci researched it in 1898, N. Densusianu in 1913 and I. Vintilescu in 1941, in 1961, V. Decu; Marcian Bleahu, I. Povară and G. Diaconu joined in 1974. It was divided by speleologists into several sectors (the exploration is not yet complete).
More important archaeologically is the "Woman's Cave" sector, leading to the "Bat Corridor", then to the "Fireplace Corridor", where we identified fireplaces from the Neolithic, the Dacian period and the Middle Ages. There were also pottery and metal artefacts. Archaeological excavations were conducted also on the outside, which uncovered iron ore processing furnaces from the Dacian period. The researches were joined also by E. Bujor, Vasile Boroneant et al. In several places also fossil fauna (Ursus spaeleus) was identified as well. It is one of the most beautiful and important caves in the world. The cave is protected and closed for tourists. Visitation is regulated. The archaeological traces uncovered belong to the Neolithic Age, Hallstatt Age, the Dacian period and the Middle Ages.